The cause of the overnight fire at 220 Clavet Street remains unknown. The blaze broke out in the attic of the one and a half storey home. Marty Patterson of the city Fire Service says they've completed their inspection of the fire scene. He says he examined the scene the best he could, but wasn't able to figure out exactly how the fire started and for that reason it's being listed as undetermined. No one was hurt in the fire.